One thing is common, though. They all use chinese characters: hanzi (Chinese) or kanji (Japanese) or hanja (Korean). In Korean chinese characters are used less frequently.
The Korean and Arabic languages were added about in the same time on the Verbix website. Both languages support conjugating verbs since a few months back.
It has been interesting to follow how many verbs have been conjugated since then. Today (9/21/2011) Arabic verbs have been conjugated 59,241 times and Korean verbs 58,226 times.
In the all-time ranking these languages now have the 44th and 45th place in the number of verbs having been conjugated. The most conjugated language is Spanish with verbs having been conjugated 76,986,823 times!
Links to go: